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[Bug 1867072] Re: ARM: tag bits cleared in FAR_EL1
From: |
Richard Henderson |
Subject: |
[Bug 1867072] Re: ARM: tag bits cleared in FAR_EL1 |
Date: |
Thu, 12 Mar 2020 16:04:56 -0000 |
Ho hum, I must have been asleep last night.
Peter only merged 7 of 9 patches. The final 2 were re-posted:
https://patchew.org/QEMU/address@hidden/
which includes the critical change that affects FAR_ELx.
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https://bugs.launchpad.net/bugs/1867072
Title:
ARM: tag bits cleared in FAR_EL1
Status in QEMU:
In Progress
Bug description:
The ARM Architecture Reference Manual provides the following for
FAR_EL1:
"For a Data Abort or Watchpoint exception, if address tagging is
enabled for the address accessed by the data access that caused the
exception, then this field includes the tag."
However, I have found that the tag bits in FAR_EL1 are always clear,
even if the tag bits were set in the original access.
I can reproduce the problem on both 4.1.1 and master
(6e8a73e911f066527e775e04b98f31ebd19db600).
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